Garmin eTrex Manuale Proprietario

46

Interface formats are selected from the SETUP Page. 

The input/output lines on your eTrex are RS-232 compat-
ible, allowing easy interface to a wide range of external 
devices, including PC’s, differential beacon receivers, 
marine autopilots and/or a second GPS receiver.

The NMEA 0183 version 2.3 interface format is 

supported by the eTrex and enables the unit to drive up 
to three NMEA devices.

GPGGA, GPGLL, GPGSA, GPGSV, GPRMB, GPRMC, 
GPRTE, GPVTG, GPWPL, GPBOD

PGRME (estimated error), PGRMM (datum string),  
PGRMZ (altitude), PSLIB (beacon receiver control)

DGPS (Differential GPS) corrections are accepted in 

RTCM SC-104 version 3.0 format through the ‘Data In’ 
line. The Garmin GBR 21 and GBR 23 are the recom-
mended beacon receivers for use with the eTrex. Other 
beacon receivers with the correct RTCM format may be 
used, but may not correctly display status or allow tuning 
control from the GPS unit. 

The eTrex may be hard-wired to a serial connec-

tor using the Data Cable (see the Garmin web site, 
www.garmin.com for ordering information). Refer to 
the wiring diagram and the eTrex unit data connection 
illustrated below.

The optional PC Interface Cable allows you to connect 

your eTrex to a PC-compatible computer’s serial port.

Power (+)

Data Out

Data In 

Ground (-)

Ground (-)

Data Out

Data In 

Green

White

Black

Data Cable

eTrex 
Connector

etrex manual.indd   46

2/19/2003, 1:37:29 PM